WO2011145134A1 - バックライトユニット及びそのバックライトユニットを用いた液晶表示装置 - Google Patents
バックライトユニット及びそのバックライトユニットを用いた液晶表示装置 Download PDFInfo
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- WO2011145134A1 WO2011145134A1 PCT/JP2010/003307 JP2010003307W WO2011145134A1 WO 2011145134 A1 WO2011145134 A1 WO 2011145134A1 JP 2010003307 W JP2010003307 W JP 2010003307W WO 2011145134 A1 WO2011145134 A1 WO 2011145134A1
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- light source
- backlight unit
- solid
- liquid crystal
- source elements
- Prior art date
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/02—Refractors for light sources of prismatic shape
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
- G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F13/00—Illuminated signs; Luminous advertising
- G09F13/04—Signs, boards or panels, illuminated from behind the insignia
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0018—Redirecting means on the surface of the light guide
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
- G02B6/0073—Light emitting diode [LED]
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133628—Illuminating devices with cooling means
Definitions
- the present invention relates to a backlight unit for displaying a liquid crystal panel or the like and a liquid crystal display device using the backlight unit.
- a backlight unit of a liquid crystal display device using a solid light source element for example, an LED element
- a solid light source element for example, an LED element
- a method called a mold and a method called a side lamp type (or side edge type) in which a light guide plate is provided on the back side of a liquid crystal panel and LED elements are arranged in a row in the thickness direction are known.
- the direct-type backlight unit 1 shown in FIG. 9 includes an LED backlight array 2 in which a plurality of LEDs are arranged in the vertical and horizontal directions as a light source, and is fixed to the rear chassis 3 on the back side.
- a reflector 4 is provided.
- a brightness enhancement film (DBEF) 5 In the light emission direction of the LED, a brightness enhancement film (DBEF) 5, a prism film 6, and a diffusion film 7 are disposed in order in order to diffuse light emitted from the plurality of LEDs in the light traveling direction.
- a drive circuit board 11 for driving the LEDs and the liquid crystal panel 10 is provided on the back side of the back chassis 3.
- a liquid crystal panel 10 is disposed on the light emitting side of the diffusion film 7 in the backlight unit 1, and these constitute a liquid crystal display device 12.
- the direct type backlight unit 1 has a configuration in which a large number of LEDs are arranged to face the entire back surface of the liquid crystal panel 10.
- a direct type backlight unit there are inventions described in Patent Documents 1, 2, and 3, for example.
- the drive circuit board 11, the rear chassis 3, the reflection are reflected from the back side, similarly to the direct type backlight unit 1 described above.
- a plate 4, a brightness enhancement film (DBEF) 5, a prism film 6, and a diffusion film 7 are sequentially disposed.
- DBEF brightness enhancement film
- a light guide plate 15 is disposed between the reflector 4 and the brightness enhancement film 5, and an LED backlight array 16 in which LEDs are arranged in a line along the side surface in the thickness direction of the light guide plate 15 is provided. Yes.
- the liquid crystal panel 10 is disposed further on the light emission side of the backlight unit 14.
- the conventional direct-type backlight unit 1 has a configuration in which a large number of LEDs are arranged on the entire surface in the horizontal and vertical directions as the LED backlight array 2, so that the power consumption of these LEDs increases. There is a disadvantage of going against power saving. In addition, since the heat generated by a large number of LEDs cannot be efficiently radiated, the luminous efficiency of the LEDs is lowered, and from this point, there is a disadvantage that power saving cannot be achieved. Further, the side lamp type backlight unit 14 has a configuration in which the LEDs are arranged on the side surface in the thickness direction of the light guide plate 15, so that the side portion of the liquid crystal display device 12 is enlarged and enlarged.
- an object of the present invention is to provide a backlight unit that can save power and can be miniaturized, and a liquid crystal display device using the backlight unit.
- the backlight unit according to the present invention includes a plurality of solid state light source elements disposed as light sources, and an optical element disposed in front of the light emitting direction of the plurality of solid state light source elements to diffuse light emitted from the solid state light source elements.
- a backlight unit including an element and a housing, wherein the plurality of solid state light source elements are arranged in an annular shape.
- the light emitted from the solid light source elements arranged in an annular shape can be diffused throughout the optical element, so that it is compared with a conventional direct type backlight unit.
- power can be saved by reducing the number of solid light source elements as light sources, and light emitted from the solid light source elements can be uniformly diffused.
- the light source is not provided on the side surface as compared with the conventional sidelight type backlight unit, it is possible to prevent the backlight unit from being expanded in the side surface direction.
- the plurality of solid state light source elements are preferably arranged in a heat radiation pattern having high thermal conductivity, and the heat radiation pattern is preferably connected to the housing.
- heat generated from the solid-state light source element that emits light can be conducted to the heat radiation pattern, and heat can be conducted from the heat radiation pattern to the housing to dissipate to the outside air. Since the temperature is lowered and the light emission efficiency is improved, power can be saved.
- a prism member provided facing the light emitting direction of the plurality of solid light source elements, and a substantially V-shaped recess provided between the plurality of solid light source elements and the prism member are provided.
- the light emitted from the solid light source element may be diffused by the lens element and the prism member and emitted.
- Light emitted from the solid light source element is diffused by passing through the lens element, and further diffused widely by the prism member, so that light with uniform luminance can be emitted.
- the optical element includes a prism member provided with a substantially inverted V-shaped concave portion facing the light emission direction of the plurality of solid light source elements, and light emitted from the solid light source element is diffused by the prism member. You may make it radiate
- the light emitted from the solid light source elements arranged in an annular shape is diffused and emitted by the prism member by being refracted or reflected, and the high luminance can be maintained while suppressing the decrease in luminance.
- the plurality of solid light source elements may be arranged in a substantially rectangular ring shape, and the solid light source elements may be arranged in a central region of each side of the substantially rectangular shape at a sparser distance than the corner portion.
- the solid light source elements arranged in a substantially rectangular annular shape are preferably smaller than the outer shape of the display element or the prism member.
- the plurality of solid light source elements are arranged in a substantially rectangular annular shape, and the central region of each side of the solid light source elements arranged in the substantially rectangular shape includes a solid light source element having a relatively small light amount than the corner portion. Also good.
- the solid light source elements arranged in a substantially rectangular annular shape are preferably smaller than the outer shape of the display element or the prism member.
- the plurality of solid state light source elements may be arranged in a substantially circular or substantially elliptical ring shape. Even in this case, the light emitted from the solid light source elements arranged in a ring shape can be diffused throughout the optical element, so that the solid light source as a light source compared with the conventional direct type backlight unit Power consumption can be reduced by reducing the number of light source elements, and light emitted from the solid light source elements can be uniformly diffused. In addition, since the light source is not provided on the side surface as compared with the conventional sidelight type backlight unit, the backlight unit can be prevented from being expanded in the side surface direction.
- the solid light source element is preferably an LED.
- a liquid crystal display device includes any one of the backlight units described above, and a liquid crystal panel disposed in the light emission direction of the backlight unit.
- the light emitted from the solid light source elements arranged in an annular shape can be diffused throughout the optical element, so that Compared with a type-type backlight unit, the number of solid-state light source elements used can be reduced and power can be saved.
- the apparatus since the solid light source element is provided on the back side so as to face the optical element, the apparatus can be reduced in size without extending to the side as compared with the conventional sidelight type backlight unit, and the solid light source element The maximum optical path length from the display element to the display element can be set short, and it becomes easy to obtain luminance uniformity.
- FIG. 1 It is a disassembled perspective view which shows typically the structure of the liquid crystal display device containing the backlight unit by 1st embodiment of this invention. It is principal part sectional drawing which shows the structure of the liquid crystal display device by 1st embodiment.
- (A) is a top view which shows LED and a cooling pattern
- (b) is an enlarged view of LED in (a). It is a fragmentary sectional view which shows the attachment structure to the board
- FIG. 1 It is a schematic diagram which shows the positional relationship of a liquid crystal panel and the arrangement pattern of LED, and the optical path length from LED, (a) is based on 1st embodiment, (b) is based on the conventional side lamp type system. It is principal part sectional drawing which shows the structure of the liquid crystal display device by 2nd embodiment of this invention. The modification of the arrangement pattern to the board
- the liquid crystal display device 20 includes a backlight unit 21 and a liquid crystal panel 22.
- the backlight unit 21 is disposed by laminating a substrate 25 in which a plurality of LEDs 24 as light sources are arranged in a rectangular frame at predetermined intervals, and on the light emitting side of these LEDs 24.
- the liquid crystal panel 22 includes a liquid crystal element and polarizing plates stacked before and after the liquid crystal element.
- the substrate 25 in the backlight unit 21 is formed in, for example, a rectangular plate shape whose outer shape is smaller than that of the liquid crystal panel 22, and the rectangular frame-shaped LED cooling is performed along each side of the substrate 25.
- the pattern 31 is fixed.
- the LED 24 is fixed to the substrate 25 at a predetermined interval on the cooling pattern 31 by soldering or the like, and the cooling pattern 31 is made of a material such as a metal having high thermal conductivity such as copper foil in order to release the heat generated by the LED 24 that emits light. Is formed.
- a terminal of the LED 24 fixed to the substrate 25 is inserted into a hole 31 a formed in the cooling pattern 31 in a non-contact manner and connected to an electrode 32 provided on the substrate 25.
- each LED 24 is laminated with the cooling pattern 31 in a non-energized state and bonded to the substrate 25. 4 and 5, an LED drive circuit 34 having electrodes 32 and a drive circuit 35 for driving the liquid crystal panel 22 are fixed to the back surface of the substrate 25.
- the LED cooling pattern 31 on the substrate 25 is formed wider than the LED 24.
- the casing 26 and the reflection plate 27 are formed with rectangular windows 26a and 27a larger than the LEDs 24 arranged in an annular shape with an inner diameter smaller than that of the substrate 25 at the center.
- the frame portions of the 26 window portions 26a are arranged so as to contact the LED cooling pattern 31 over the entire circumference.
- the casing 26 is made of a material having high thermal conductivity such as aluminum. Therefore, the heat generated from the LED 24 can be transmitted from the LED cooling pattern 31 to the housing 26 and radiated into the air.
- the reflecting plate 27 has a reflecting surface 27 b that faces the lens 28 on the opposite side to the bonding surface that contacts the casing 26.
- the lens 28 shown in FIG. 2 has a rectangular shape that is larger than the substrate 25 and smaller than the prism plate 29 and the liquid crystal panel 22, for example.
- a concave portion 37 having a substantially V-shaped cross section is formed on a surface 28 a facing the prism plate 29 of the lens 28 in a region facing each LED 24 provided on the substrate 25, and two inclined surfaces 37 a and 37 b of the concave portion 37 are formed.
- the valley line formed by is preferably located offset from the center of the LED 24 toward the center of the lens 28.
- the recessed part 37 may be continuously formed in the rectangular frame shape along the arrangement
- a prism plate 29 constituting a prism member is formed by arranging a plurality of prisms 39 having a triangular section on a light incident surface 29a on the lens 28 side, extending in a certain direction, for example, a direction orthogonal to the paper surface, in parallel.
- the exit surface 29b on the diffusion plate 30 side is, for example, a flat surface.
- the light traveling toward the prism plate 29 is refracted by the inclined surfaces of the plurality of prisms 39 and transmitted through the prism plate 29.
- incident light can be diffused so as to be uniform only in a direction orthogonal to the extending direction of the prisms 39.
- the diffusion plate 30 can diffuse incident light at random because, for example, diffusion particles are dispersed and mixed at random.
- a plurality of LEDs 24 as light sources are annularly arranged in a size smaller than the outer shape forming the rectangle of the liquid crystal panel 22.
- the number of LEDs 24 is smaller than the LED light source of the conventional direct type backlight unit.
- a plurality of LEDs 24 arranged in a rectangular shape are formed in a shape similar to that of the liquid crystal panel 22, the maximum light until the light emitted from the LEDs 24 reaches the farthest position (for example, a corner portion) of the liquid crystal panel 22.
- the optical path length is a length La in a diagonal direction in plan view.
- the external dimensions of the liquid crystal panel 22 and the light guide plate 15 are arranged in order to arrange the LEDs 24 on one side in the thickness direction of the light guide plate 15.
- the maximum optical path length is a length Lb (> La) corresponding to the side adjacent to the side where the LED 24 is disposed. Therefore, in the backlight unit 21 according to the present embodiment, the maximum optical path length La can be made shorter than Lb, so that a decrease in light luminance can be reduced.
- the liquid crystal display device 20 having the backlight unit 21 according to the present embodiment has the above-described configuration, and the operation thereof will be described next. 1 to 3, the light H emitted from the LEDs 24 arranged in a rectangular frame shape fixed to the substrate 25 on the LED cooling pattern 31 is emitted forward and enters from the incident surface 28 b of the lens 28. A part of the light H1 is refracted in the lens 28 and is emitted from the concave portion 37 having a substantially V-shaped cross section formed on the emission surface 28a.
- a part of the light H2 and H3 is reflected by the inclined surfaces 37a and 37b of the concave portion 37 and proceeds to the outside and the inside of the lens 28, and a part of the light H2 traveling to the outside of the lens 28 is emitted from the lens 28. Proceed in the direction of the prism plate 29 arranged on the side or proceed to the reflection plate 27. Further, a part of the light H3 traveling inside the lens 28 also travels in the direction of the prism plate 29 disposed on the light emitting side of the lens 28. The light H2 traveling to the reflecting plate 27 is reflected by the reflecting surface 27a of the reflecting plate 27 and travels toward the prism plate 29.
- these lights H1, H2, and H3 traveling to the prism plate 29 are incident from one inclined surface of the prism 39 arranged on the incident surface, refracted toward the central axis side of the backlight unit 21, and the direction of the diffusion plate 30 Proceed to In the prism plate 29, the incident light can be diffused so as to be substantially uniform only in the direction orthogonal to the extending direction of the plurality of prisms 39. Incident light cannot be diffused in the extending direction of the prism 39.
- the incident light can be diffused randomly including the extending direction of the prism 39 by the diffused particles randomly dispersed and mixed. In this way, the light diffused almost uniformly over the entire liquid crystal panel 22 is incident on the entire liquid crystal panel 22 from the diffuser plate 30 and is transmitted therethrough, so that a liquid crystal image with substantially uniform brightness can be observed.
- the LED 24 emits light by causing the LED 24 to emit light as described above, but the heat generated in the LED 24 is the heat that contacts the hole 26 a through the LED cooling pattern 31 provided on the substrate 25. It is transmitted to the housing 26 made of a material having high conductivity, and is radiated to the outside air through the housing 26. Therefore, the LED 24 can be quickly cooled.
- the liquid crystal display device 20 including the backlight unit 21 the light emitted from the plurality of LEDs 24 arranged in a rectangular ring shape smaller than the liquid crystal panel 22 is used as the lens 28 and the prism plate 29.
- the liquid crystal panel 22 can be diffused by being reflected or refracted by the diffusing plate 30, the number of LEDs 24 used can be reduced and power can be saved as compared with the conventional direct type liquid crystal display device. it can.
- the substrate 25 in which the LEDs 24 are arranged in a ring shape as the light source is arranged on the back side of the liquid crystal display device 20, it is possible to prevent the side surfaces from being expanded as compared with the conventional side lamp type liquid crystal display device.
- the maximum optical path length La from the LED 24 to the farthest corner of the liquid crystal panel 22 can be shortened as compared with the conventional side lamp type liquid crystal display device. High uniformity. Furthermore, the heat generated in the LED 24 can be transmitted to the housing 26 via the LED cooling pattern 31 having high thermal conductivity on the substrate 25 and can be dissipated into the air, so that the temperature of the LED 24 is lowered and the luminous efficiency of the LED 24 is reduced. As well as improving power consumption.
- a liquid crystal display device provided with a backlight unit according to the second embodiment of the present invention will be described with reference to FIG. 7, but the same or similar parts and members as those in the first embodiment will be described using the same reference numerals. Is omitted.
- the lens 28 is not provided in the backlight unit 42 of the liquid crystal display device 41 according to the second embodiment shown in FIG.
- a prism plate 43 is provided on the light emission surface side of the LED 24 fixed to the substrate 25 via the LED cooling pattern 31.
- the light incident surface 43a facing the LED 24 is substantially flat, and a concave portion 44 having an inverted V-shaped cross section is formed at a position facing the LED 24.
- the concave portion 44 is formed by two inclined surfaces 44 a and 44 b so as to form an inverted V-shaped cross section, and the valley lines of the inclined surfaces 44 a and 44 b are arranged so as to be biased toward the center side of the prism plate 43 from the center of the LED 24. Yes.
- the concave portion 44 that forms an inverted V-shaped cross section may be formed in a rectangular annular shape that is opposed to the plurality of LEDs 24, or may be divided for each LED 24.
- a prism 45 having a triangular cross section is arranged on the exit surface 43b facing the entrance surface 43a of the prism plate 43.
- the prism 45 extends in a direction perpendicular to the paper surface and is parallel to the direction parallel to the paper surface. It is formed in an array.
- the light H emitted from the LED 24 enters the prism 43 by being refracted by one or the other inclined surfaces 44a and 44b of the concave portion 44 on the incident surface 43a of the prism 43, for example, and a part of the light is forward as it is.
- the other part of the light travels laterally outward or inward and is refracted by one of the inclined surfaces of the plurality of prisms 45 on the exit surface 43b.
- the light is diffused in the direction orthogonal to the extending direction of the prism 45 and emitted from the prism plate 43, and then diffused in the vertical and horizontal directions by the diffusion plate 30 to enter the liquid crystal panel 22. To do.
- a part of the light is reflected by the incident surface 43 a of the prism plate 43 or the inclined surfaces 44 a and 44 b of the concave portion 44, re-reflected by the reflecting surface 27 a of the reflecting plate 27, and enters the prism plate 43.
- the light emitted from the LED 24 is diffused throughout the liquid crystal panel 22 by being repeatedly refracted and reflected by the prism plate 43 and the reflection plate 27.
- the same effect as the first embodiment can be exhibited, and since the lens 28 is not provided, there are few optical members to be transmitted, and the luminance is reduced. Can be suppressed.
- the LEDs 24 on the substrate 25 are formed in, for example, a similar, substantially rectangular ring shape with respect to the outer shape of the liquid crystal panel 22, but the arrangement configuration of the LEDs 24 according to the present invention is as described above.
- the configuration is not limited.
- the plurality of LEDs 24 arranged on the substrate 25 are arranged in a rectangular shape, for example.
- the plurality of LEDs 24 on each side have a configuration in which the arrangement interval is changed so that the arrangement interval is sparse at the center portion of the side and dense at the corner portion.
- the light emitted from each LED 24 is refracted or reflected via the lens 28 and the prism plate 29 or the prism plate 43, the diffusion plate 30 and the like, and the amount of light is attenuated before reaching the liquid crystal panel 22. Brightness decreases.
- the optical path length Lc from the LED 24 arranged in the rectangular shape to the four sides of the liquid crystal panel 22 is the optical path length Lc from the LED 24 in the corner portion to the corner portion of the liquid crystal panel 22.
- the longest optical path length Ld from the LED 24 at the center of the side to the center of the side of the liquid crystal panel 22 is the shortest. Therefore, the intervals between the LEDs 24 arranged facing the center of the side of the liquid crystal panel 22 are sparsely arranged, and the intervals between the LEDs 24 arranged facing the corner portion of the liquid crystal panel 22 are arranged densely. Thus, a liquid crystal image having a more uniform luminance can be obtained over the entire liquid crystal panel 22.
- the plurality of LEDs 24 arranged on the substrate 25 are arranged in a rectangular ring shape at equal intervals.
- the LEDs 24a arranged at the center of each side are arranged such that the illuminance is smaller than that of the LEDs 24 arranged at the corners, or the illuminance is set to be smaller.
- the luminance at the corner portion and the central side portion of the liquid crystal panel 22 is substantially the same. Therefore, a liquid crystal image with a more uniform luminance can be obtained over the entire liquid crystal panel 22 as in the first modification.
- by reducing the light amount at the center of the side of the LED 24 from the corner portion it is possible to improve the uniformity of the luminance of the liquid crystal screen and to achieve the power saving effect.
- the arrangement structure of the plurality of LEDs 24 on the substrate 25 is not limited to a rectangular ring shape.
- the LEDs may be arranged in an elliptical shape, or may be an appropriate polygon such as a circle, hexagon, or octagon.
- the backlight units 21 and 42 in the above-described embodiment, light is uniformly diffused by the prism plates 29 and 43 in which a plurality of prisms 39 and 45 are arranged in one direction and the diffusion plate 30.
- the liquid crystal display devices 20 and 41 are configured so that the horizontal (horizontal) field of view is wider than the vertical (vertical) direction, the prisms 39 and 45 of the prism plates 29 and 43 are extended in the vertical direction. It is preferable to arrange them horizontally.
- the backlight units 21 and 42 according to the present invention are not limited to the liquid crystal display devices 20 and 41 that transmit and display the liquid crystal panel 22, and can be used for other transmission type and reflection type display devices.
- the present invention provides a backlight unit reduced in power consumption and miniaturized by using an LED as a light source of a backlight unit in a ring shape on the back surface of an optical element such as a prism member, and a liquid crystal display device using the backlight unit To do.
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Abstract
Description
そして、バックライトユニット1における拡散フィルム7の更に光出射側には、液晶パネル10が配設されており、これらは液晶表示装置12を構成する。
直下型方式のバックライトユニット1は、多数のLEDを液晶パネル10の背面全体に対向して配列させる構成を備えている。
このような直下型方式のバックライトユニットを備えた先行技術として、例えば特許文献1、2,3に記載された発明がある。
そして、バックライトユニット14の更に光出射側には、液晶パネル10が配設されている。
また、サイドランプ型方式のバックライトユニット14では、導光板15の厚み方向の側面にLEDを配列した構成であるため、液晶表示装置12の側部が拡張して大型化するという欠点がある。
本発明によるバックライトユニットによれば、環状に配列された固体光源素子から発光された光を、光学素子を介して全体に拡散させることができるので、従来の直下型方式のバックライトユニットと比較して光源としての固体光源素子の数を減少させることで省電力化できると共に、固体光源素子からの出射光を均一に拡散できる。また、従来のサイドライト型のバックライトユニットと比較して側面に光源を設けていないので、バックライトユニットが側面方向に拡張されることを防止できる。
本発明によるバックライトユニットによれば、発光する固体光源素子から発生する熱を放熱用パターンに伝導させ、この放熱用パターンから筐体に熱を伝導させて外気に放熱できるから、固体光源素子の温度が低下して発光効率が向上するため、省電力化できる。
固体光源素子から出射する光はレンズ素子を透過することで拡散させられ、更にプリズム部材によって広く拡散させられるから、均一な輝度の光を出射できる。
環状に配列された固体光源素子から出射した光はプリズム部材で屈折や反射等して広く拡散させられて出射されることになり、輝度の低下を抑制して高輝度を維持できる。
この場合、略長方形の環状に配列された固体光源素子は表示素子やプリズム部材の外形形状より小さいことが好ましい。
あるいは、複数の固体光源素子は略長方形の環状に配列され、この略長方形に配列された固体光源素子における各辺の中央領域はコーナー部よりも比較的光量の小さい固体光源素子が含まれていてもよい。
この場合でも、略長方形の環状に配列された固体光源素子は表示素子やプリズム部材の外形形状より小さいことが好ましい。
この場合でも、環状に配列された固体光源素子から発光された光を、光学素子を介して全体に拡散させることができるので、従来の直下型方式のバックライトユニットと比較して光源としての固体光源素子の数を減少させて省電力化できると共に、固体光源素子からの出射光を均一に拡散できる。また、従来のサイドライト型のバックライトユニットと比較して側面に光源を設けないから、バックライトユニットが側面方向に拡張されることを防止できる。
なお、固体光源素子はLEDであることが好ましい。
また、固体光源素子を光学素子に対向させて背面側に設けたので、従来のサイドライト方式のバックライトユニットと比較して、装置が側面に拡張することがなく小型化でき、しかも固体光源素子から表示素子に至る最大光路長を短く設定できて輝度の均一性を得やすくなる。
まず、本発明の第一実施形態によるバックライトユニットを含む液晶表示装置を図1乃至図6により説明する。
図1に示すように、液晶表示装置20は、バックライトユニット21と液晶パネル22からなる。バックライトユニット21は、図1及び図2に示すように、光源としてのLED24を所定間隔で長方形枠状に複数配列させた基板25と、これらのLED24の光出射側に積層して配設された筐体26及び反射板27と、LED24から出射した光を拡散させるレンズ28と、拡散した光を更に拡散させるプリズム板29と、拡散板30とが順次配列して構成されている。
また、液晶パネル22は液晶素子とその前後に積層された偏光板とで構成されている。
基板25に固定されたLED24の端子は冷却パターン31に形成された孔部31aに非接触で挿通して基板25に設けた電極32に接続されている。そのため、各LED24は冷却パターン31と非通電状態で積層されて基板25に接合されている。図4及び図5において、基板25の裏面には電極32を有するLED駆動回路34と液晶パネル22を駆動させるための駆動回路35が固定されている。
そのため、LED24から発生した熱をLED冷却パターン31から筐体26に伝達させて空気中に放熱することができる。
また、反射板27は筐体26に当接する接合面とは反対側のレンズ28に対向する面が反射面27bとされている。
そのため、LED24から出射する光の多くは凹部37の外側の傾斜面37aに入射し、その一部の光は反射して、プリズム板29に向かうか反射板27の反射面27aで反射してプリズム板29に向かうことになり、残りの一部の光は傾斜面37aで屈折して透過する。また、LED24から出射する光の一部は凹部37の内側の傾斜面37bで反射するか屈折して透過する。
プリズム板29では、プリズム39が一方向に配列された構成であるために、入射する光をプリズム39の延在方向に直交する方向でのみ均一になるよう拡散できる。拡散板30は、例えば拡散粒子がランダムに分散混入されているから、入射する光をランダムに拡散させることができる。
一方、図6(b)に示す従来のサイドランプ型方式のバックライトユニットでは、導光板15の厚み方向の一側面にLED24を一列に配列するために、液晶パネル22と導光板15の外形寸法を同一として、最大光路長はLED24を配設した辺に隣接する辺に相当する長さLb(>La)となる。
そのため、本実施形態によるバックライトユニット21では、最大光路長LaをLbより短くできるから光の輝度の低下を低減できる。
図1乃至図3において、LED冷却パターン31上で基板25に固定された長方形枠形状に配列されたLED24から出射された光Hは、前方に放射されてレンズ28の入射面28bから入射する。そして、一部の光H1はレンズ28内で屈折して出射面28aに形成された断面略V字形状の凹部37から出射する。
また、一部の光H2、H3は凹部37の傾斜面37a、37bで反射させられてレンズ28の外側と内側に進み、レンズ28の外側に進行する光H2の一部はレンズ28の光出射側に配設されたプリズム板29方向に進むか、反射板27に進む。また、レンズ28の内側に進行する光H3の一部もレンズ28の光出射側に配設されたプリズム板29方向に進む。反射板27に進む光H2は反射板27の反射面27aで反射させられてプリズム板29方向に進む。
プリズム板29では、入射する光を複数のプリズム39の延在方向に直交する方向についてのみほぼ均一になるよう拡散できる。プリズム39の延在方向については入射光の拡散はできない。
そして、プリズム板29で拡散された光が拡散板30に入射すると、ランダムに分散混入された拡散粒子により、入射光がプリズム39の延在方向を含めてランダムに拡散させることができる。このようにして、液晶パネル22全体にほぼ均一に拡散された光が拡散板30から液晶パネル22全体に入射して透過することでほぼ均一な輝度の液晶画像を観察できる。
しかも、光源としてLED24を環状に配列した基板25を液晶表示装置20の背面側に配置したから、従来のサイドランプ方式の液晶表示装置と比較して、側面が拡張されることを防止できる。図6に示すように、LED24から液晶パネル22の最も遠い位置になるコーナー部までの最大光路長Laを、従来のサイドランプ方式の液晶表示装置と比較して短くできるので、液晶画面の輝度の均一性が高い。
更に、LED24で発生した熱を基板25上の熱伝導性の高いLED冷却パターン31を介して筐体26に伝達し、空気中に放熱することができるので、LED24の温度が下がりLED24の発光効率を向上させると共に省電力化できる。
図7に示す第二実施形態による液晶表示装置41のバックライトユニット42において、上述の第一実施形態と相違してレンズ28は設けられていない。そして、LED冷却パターン31を介して基板25に固定されたLED24の光出射面側にプリズム板43が設けられている。
また、プリズム板43の入射面43aに対向する出射面43bには例えば断面三角形をなすプリズム45が配列され、プリズム45は紙面に直交する方向に延在すると共に紙面に平行な方向に平行に複数配列して形成されている。
そして、光がプリズム45の延在方向に直交する方向に拡散させられてプリズム板43から出射した後、拡散板30で拡散作用を受けて縦及び横方向に拡散させられて液晶パネル22へ入射する。また、一部の光はプリズム板43の入射面43aまたは凹部44の傾斜面44a、44bで反射し、反射板27の反射面27aで再反射させられてプリズム板43に入射することになる。
そのため、結果として、LED24から射出した光は、プリズム板43と反射板27で屈折や反射を繰り返すことによって、液晶パネル22全体に拡散される。
上述の各実施形態においては、液晶パネル22の外形形状に対して、基板25上のLED24は例えば相似的に小さい略長方形の環状に形成されているが、本発明によるLED24の配列構成は上述の構成に限定されるものではない。
ここで、各LED24から発光する光は、レンズ28及びプリズム板29またはプリズム板43,拡散板30等を経由して屈折したり反射したりして液晶パネル22に到達するまでに光量が減衰して輝度が低下する。
そのため、複数のLED24を長方形状に配列させた場合、長方形状に配列されたLED24から液晶パネル22の四辺までの光路長は、コーナー部のLED24から液晶パネル22のコーナー部までの光路長Lcが最も長く、辺の中央部のLED24から液晶パネル22の辺の中央部までの光路長Ldが最も短い。そのため、液晶パネル22の辺の中央部に対向して配置されているLED24の間隔を疎に配列し、液晶パネル22のコーナー部に対向して配置されているLED24の間隔を密に配列することで、液晶パネル22全体でより均一な輝度の液晶画像が得られる。
この構成により、コーナー部に配列されたLED24の照度より辺の中央部に配列されたLED24aの照度が小さいために、液晶パネル22のコーナー部と辺中央部とで輝度がほぼ同一になる。よって、第一変形例と同様に液晶パネル22全体でより均一な輝度の液晶画像が得られる。
これら第一及び第二変形例によっても、LED24の辺中央部の光量をコーナー部より低下させることで、液晶画面の輝度の均一性を向上できると共に省電力化の効果が得られる。
また、本発明によるバックライトユニット21,42は液晶パネル22を透過表示する液晶表示装置20,41に限定されることなく、その他の透過型や反射型の表示装置に採用できる。
21、42 バックライトユニット
22 液晶パネル
24 LED
25 基板
26 筐体
27 反射板
28 レンズ
29、43 プリズム板
30 拡散板
31 LED冷却パターン
37、44 凹部
37a、37b、44a、44b 傾斜面
39、45 プリズム
Claims (9)
- 光源として配設された複数の固体光源素子と、該複数の固体光源素子の光出射方向前方に配設されていて照射された光を拡散させる光学素子と、筐体と、を備えたバックライトユニットであって、
前記複数の固体光源素子は環状に配設されていることを特徴とするバックライトユニット。 - 前記複数の固体光源素子は放熱用パターンに配設され、該放熱用パターンは前記筐体に接続されている請求項1に記載されたバックライトユニット。
- 前記光学素子として、前記複数の固体光源素子の光出射方向に対向して設けられたプリズム部材と、前記複数の固体光源素子とプリズム部材との間に設けられていて略V字形状の凹部を設けたレンズ素子とを備え、
前記固体光源素子から出射する光は前記レンズ素子とプリズム部材とで拡散させられて出射するようにした請求項1または2に記載されたバックライトユニット。 - 前記光学素子として、前記複数の固体光源素子の光出射方向に対向して略逆V字形状の凹部を設けたプリズム部材が備えられ、前記固体光源素子から出射する光は前記プリズム部材で拡散させられて出射するようにした請求項1または2に記載されたバックライトユニット。
- 前記複数の固体光源素子は略長方形の環状に配列され、該略長方形における各辺の中央領域はコーナー部よりも疎の間隔で固体光源素子が配列されている請求項1乃至4のいずれか1項に記載されたバックライトユニット。
- 前記複数の固体光源素子は略長方形の環状に配列され、該略長方形に配列された固体光源素子における各辺の中央領域はコーナー部よりも比較的光量の小さい固体光源素子が含まれている請求項1乃至4のいずれか1項に記載されたバックライトユニット。
- 前記複数の固体光源素子は略円形または略楕円形の環状に配列されていることを特徴とする請求項1乃至4のいずれか1項に記載されたバックライトユニット。
- 前記固体光源素子はLEDである請求項1乃至7のいずれか1項に記載されたバックライトユニット。
- 請求項1乃至8のいずれか1項に記載された前記バックライトユニットと、該バックライトユニットの光出射方向に配設された液晶パネルとを備えた液晶表示装置。
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2010
- 2010-05-17 WO PCT/JP2010/003307 patent/WO2011145134A1/ja active Application Filing
- 2010-05-17 US US13/698,177 patent/US9097934B2/en not_active Expired - Fee Related
- 2010-05-17 CN CN201080066792.2A patent/CN102893074B/zh not_active Expired - Fee Related
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JP2007311561A (ja) * | 2006-05-18 | 2007-11-29 | Showa Denko Kk | 表示装置、発光装置、および固体発光素子基板 |
JP2010056061A (ja) * | 2008-08-27 | 2010-03-11 | Lg Display Co Ltd | バックライトユニット及びこれを用いた液晶表示装置 |
JP4461197B1 (ja) * | 2009-04-27 | 2010-05-12 | 株式会社東芝 | 面状照明装置およびこれを備えた液晶表示装置 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN115047678A (zh) * | 2022-06-30 | 2022-09-13 | 厦门天马微电子有限公司 | 一种背光模组及显示装置 |
CN115047678B (zh) * | 2022-06-30 | 2024-01-16 | 厦门天马微电子有限公司 | 一种背光模组及显示装置 |
Also Published As
Publication number | Publication date |
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US20130128188A1 (en) | 2013-05-23 |
US9097934B2 (en) | 2015-08-04 |
CN102893074B (zh) | 2015-06-24 |
CN102893074A (zh) | 2013-01-23 |
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